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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd216d02eb2cc8f6ae375c33bdb1bf6a9dd7ed24e7ba1847bad180a5eb6ba2bb9' 
  AND token = 'NRxql82Oxs4JYCdxq2G7Hqnxaestv8sSauxPOoxQnhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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