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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a75175dc0bfcf4deaf57b551722b99f92c9aea6cf238ad9258b67e715e0284b6' 
  AND token = 'eg0ZcQUiBenM+OE0hbwc0uEvHHYoAGENZJldSM+1F+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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