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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56086c26153cf8c80cc8b3cf3cefad6de82799d4897f726ef5081ea7a3d2bc1a' 
  AND token = 'OxHRaYA0VNDf8uPcMRzA/0mGUDiQrwpHYgj67OFE2XY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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