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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d4995828c06e254cfe8443bbf9d714f586aaa47339c8074ea7b476d7648e937' 
  AND token = 'clt5E2upKYDbcqyISMqPYQ9Q6NIM2wIfT7XeS9hx8mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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