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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edfc5c82c134c423ff68e3e49cc72e6dee9a0714b36cd3f6e9d35954dc23b67f' 
  AND token = 'P6suLJkOMSSJ5k+Jj89TZSGePpO+uYdAmrQfEDD/IqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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