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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e060dfe102422af796dba336eb14b3795b4dea28052e60d091b9aa27f74cfd31' 
  AND token = 'mz8GfXuzcviRNl1eVRjlPa4RbTxW2J2NoqglkhoYBNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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