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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b27d2c8fae18b889b3d379b8dd6aee1d35930276c1c4cd46d7688c46047d6e' 
  AND token = 'e+ZHrlOkdQmBBFeVe0rpltfvvtU08y1IDRJMQ/Qly9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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