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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cd4996cfdce4320e73cd242e53fb58bd98d24564f86d7a603f2f8e158bacf89' 
  AND token = '4WycCLfoty7tu9Z8vDmQEewEHET8dnMpGKWaDvQ8whI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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