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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea80e60380674d1b3f14a7e7ac5b586c32434d11af076536936995c82267874' 
  AND token = 'tIgolOFYgfPRVS7kcHd+xLqmXF23Xex7F+7GrNjh0Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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