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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2a61a743a755b0208e1891a11fb05bc0333df31d69bffd7b12c3bde176c06e6' 
  AND token = 'CnT3b0hlCmZB2QnLo+f1x7ONWJ7CoOuyN14MooturLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}