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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af66c7eabe5eaf0c70eb6c87df72f2269f4e91a42ebc4598deb31dcaf5b017bc' 
  AND token = 'kM2QrMnfhVP/rJf0UsGLcaw2QuNHowDaA7eIJ1Vd9iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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