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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40c97f974dfeb22192c36f1b496885463da8ac07ef4f2b730856b2b3b096000' 
  AND token = 'h4Clo8N4ihYMOOVuYOnCluonU4NKVVkcBcx5qOQcwyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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