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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a797ff5a430adaeb536c3a4700f94e3873a8f0ebd2003298c565f35f6c3a52' 
  AND token = '/4L8yqu5p1gyd+79j7JWEPFlmZ8yjjW8OrluSWsEj6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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