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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b1f5a4e1cb1bff4175bf17e6abcddf5dd86be8b3a9c285d25024979c9097ff' 
  AND token = 'kuOVoN29WMtWsrhJpEoD6lxMNE96uz/MjU3BIOjAKn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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