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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9524fd5536a3bfe0c01fbd52f13d998f898a636ffb8aad59ed648ccae16fe84' 
  AND token = 'ue0ikF4g8D8DfumP+CN/mU5Lgyawp8Auntf+/nfWYSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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