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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c657898c3cc0e7379964ed9139e7f17c694ad7b744f0df151030fb37d9469791' 
  AND token = 'aNqlNWB6yVKqESPYRB5ls7pa9/gx+g3JeFpzc4cAdao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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