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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d4c56fbd2ede3b48abd873bd169cbb14e8a19f3805f65b2b4acbc668cf1c1e' 
  AND token = 'ndIdxQrFh7O4gu2/m6Mt5hXHBg1He8J1Usk1xKjqCGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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