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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf563c48c5e0f8c060759f4fafbfdc3b62d6e21c18006b610f6301b620d71e4a' 
  AND token = 'lQ02bbdpCmp5STU+bo7RZdqQbA88Kwc0XepEGWuzUAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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