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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '572a085a5d1ec72cd6eac4e06420a32173691e0b928e9c097f3c09051c64e5f2' 
  AND token = 'lScndXR4fDumNdA3ZGe8WYNe1GFBJK8Ybai/UoguBDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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