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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f84db49440d32510c2c6769376436a3cfa8ebe872fa0628213ea6be7ec9eb14' 
  AND token = 'm0II8NRinsd6tbETsI13x/p/LGhasSSCqDOfkeDpd34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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