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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '064d70cadacc03f65d4b187d5a72445ed25f863bcc432c211b0008e760058bb5' 
  AND token = 'RBQIKq3Khfb6sXqw6MGNnXIK2MseubyATf8B5xI60JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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