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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84c0d2ccdcbf9787dc5fd127cff363930f230bc5a95ae221482b6d3a5e07603' 
  AND token = 'QZ/j9hnJ2tYS83j2XiDotP7CUKV6tZtHfA7C0wYaX3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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