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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43746915f3dcedaf026fb1a9a17bd7e77a8d0a945745eb248aa564e63a04f96a' 
  AND token = 'Y6aiCtiYUwNm4C8hLlSVDAyFIkQ9wBweKDbEm677xx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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