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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9cb09ca4b85092a119ece7621b43f53b764934c09f5e4ac774fa0f55a61377' 
  AND token = 'Pu667tgEl13HwelaIQyvIz7xsDE82WiTu04TRZHgOFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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