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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc671a4a644715dbf4b62de2024389d812420425e213ecb112d1bf9ee9b499e' 
  AND token = 'B8jgy/8cMo/Tj22SkgAO6wCJYJsRTLDHdt/z3j2Hm0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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