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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c8751537e524e67faf10542efe3158f71c3d1299f357104b3958515eda3330' 
  AND token = 'eEM3KPsb0xcdk0zUTlWfZOt9pk7BBLbknz8KNbUVcsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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