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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347b3a2293fdc5992fec7411424968e61cb237232932749acf9d784f16a14d33' 
  AND token = 's2PBHvRd213LYSNjjizmmHj8vQpQhxhPPiWAminUtIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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