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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67c3e4a366b222b85d32634da5cd617936c709a5c56ad69716e3ca2c3f54a6fb' 
  AND token = '9DSz781FtdpkTAb3zIOxh0vc1PvZpDssvF6pCYq9zUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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