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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01fc774aee481935ee572cc7f839a7c573eb71ead5f48f17d27ee0c0bd18568e' 
  AND token = 'j3f2j709ZAAMtjFTG5nwvu4PA1uv89ZKTptAr6mub2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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