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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1710339056a960ae520e730430ae9bcdae3c18356d06e974abba4459f810d0fe' 
  AND token = 'kTnMx7xEvM32t+LI1D46/31Pzp2q2pigNwg3LDG2R18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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