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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d87acc5112d4778d55bf10a7da891a1b1afe4ee9d1a638973b605ad91f6e9c4' 
  AND token = '3VgfYLAzIj1Ak3Jxlz4gV0lIicvMOxHzG11nC1LJou4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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