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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32067e081d5bc1da46c41645412e6ec804df98a55e303d8ff20ed9ddff785ce4' 
  AND token = '5vdMBIB29Z5xaEQnPo1QwEF/PjHQdKAGDQGRRRaKrbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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