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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '407eee5d5c86b8c0d517b4b3b27375d6c06c4c10dd2e09ea37c2dcee4063b670' 
  AND token = 'e62I/PkKYEZbUu/8DUJEu6uUuj2K+eY/Z2V10ARMi30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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