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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d24fec0e837d8b33bfe8e8e82b492da03958307440ceccf0c8f3c3bdb11819' 
  AND token = 'UDijAFh+H00VogmRaMvkRyVxSpO/02KomGuD/AGerNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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