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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e8f0dcf7ef06a30735e30ca9ec2ef3b2cab8e8a534b5c8d28df1122ffd003c9' 
  AND token = 'CqvKy92a6K6pnLEYRins3rCbr50mjP6n8hBz5mhFFYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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