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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54967b6e47e2cc249aebda9ac19afde34ddca4b88edbaeeec6207a58835f5001' 
  AND token = 'j+QFesMBDoxJku3rMGl9njwJ0FAQ5JKipNZlgEKOeNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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