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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a27875dc89e455e69f6f0b3bc903ab18cc60a8d468ca9c18935c4083d1c08384' 
  AND token = 'FcT/IyRNPJknfqLljJFzqr0qvppGCSGKL6bOWukdQWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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