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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f289a53f33c1f0155efe65a3c9f82b490668cf6ca6d197f8b040129a6b3b98' 
  AND token = 'xyJ4iekct11zKtCOacpcUn2ffZyuiMxmfn9MmhWvU1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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