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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a98c9b10e555c6aeddd425a04835fa35ea56aa3107c2274f423554c526ae08b' 
  AND token = 'kihWDd1DRkNsi9tUzp7JARyVfPJXaFYjVEKrc2Zj/xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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