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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a56dc22891293af8370f7c89aae058e6035f36878a53dc551142382308fda3d' 
  AND token = 'qJuge1PtllWy3cjoZn8LZ3nIck0bDrgcmnLTRDKVgrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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