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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5835673027424df6ef36e4f9093156a8755075b378c5dbdb54987d46ce7c7b3' 
  AND token = '74QitE1mSvXUoopfqKGC0CeLJPB40GHkIgYiQFdL4YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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