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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f8139f5531ccd7400891a23a11348e7422ce96b5fa728e89988140b0cd7fcd' 
  AND token = '2tJlarlHapGsgW0Z2UQYIETcSemHXHy1twoKw6aKwnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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