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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd956eb8b02091477d2ea7a9c4c8f649a0def9b63a83b8629c22f5418e962c3' 
  AND token = 'ubw749CULQCxUj1zrZi/AhTgjiwCpXjzlf6hyuoPQ6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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