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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56e544a099f9d9e9209a6d919914e264fb14ddcf9dd25e2d66b67cac57b0173' 
  AND token = 'iynu+Sg0sxK1UAO67krU681H9MlV7f+eKPgnMnwWbbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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