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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d8468b7f78bf64dd8bd4069c93428b9570c60535d82468cd1c0d9dcb9c8a5f7' 
  AND token = 'm/5pRL9XHPF1np4e1phDQwdVi/ho49g3Jmu5oYR8Ne8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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