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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5188253a9b78d901dd5efae5a6ec092eed0c3ae8ff1fc9ae705793218415e6e5' 
  AND token = 'K10fzCS6FMsQwzrHEi1bQ3np2/+E0AqfCU9+sBNMUX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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