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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7483d02aa9c8b5fa71bbc01038cc7cebb461ca550f1ddcfc8cceffe266bb8957' 
  AND token = '2ocMKpeQ20P5ESLP2vVfmg9l3OC1X/f2axoCxn3F4+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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