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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2dd0d2119075502d124782e309617cd0de678c82244289563f01f69181090db' 
  AND token = '65Q3oO9196nsKyZ4UTiRTQyBn7/iidAuEOyctCPPeg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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