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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192a4a06a62d37766925199caf0b55e449e2bd7b0e3768c7841fc8b1465df43f' 
  AND token = 'gRYasox41sW5VaXSJiuAFHrp0Q/9KZXkzn4TTghdP00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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