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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5843bdb3da120bb3385e3091df29db90ce87c7f8d8710c4050ee71c3f10c4e2a' 
  AND token = '1n67+ABVnzHOkmD2Jy/82kH5j2AsvxORw4oqxRoEsxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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