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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efb441a6e4280548d674126e395c0f13f324f1dcb15e9e6199bcb9c7b5003869' 
  AND token = 'J4c7qbPPMLrRdqxijlBU87z19HqUaBXXNjS9q7a4ya0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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