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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3564c3ba20e8e65f92c63fd7daac0154e9da066433b9fa32831e90f0617f71e' 
  AND token = 'HQS9fJz4dlmxtC5z1QJ/lO85EMiXeqyPWNr43UzWKnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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