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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94431fd299f7ae15c36e756b0aa29fabf05566719bd59a2d70414a3c8da0a52e' 
  AND token = 'ER68LXlNjAdK6MXg9/kDr9vuFbq3xr8QcWqo2rLHJ60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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