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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03456575740ebea71e4c6a2d1b8335d161fa99d424b70b3366fc2c71f5dae314' 
  AND token = 'InQSjNvJktqbZYjk0mTJ9Uf76BxcVgNSwudWktiV1rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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