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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116381d52e277638258904f39ae111aa2357568b118e517a1d7e749bd9e75d35' 
  AND token = '8SQ5yioM6cE118q9awNKSYAsw0AkA9w6X9hCuPQ5Dg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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