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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee8adf566b1c765f3115ec3593af5aa1500104246ed5ab7d19322ad9a4dcebc' 
  AND token = 'BqOju+lwjBg9jqjtP1QbDn+g1Uf1FraWf9EV4zIa7hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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