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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b976412433c113a526f3973011e64c7f318a343fbd537bd79a250fa29ef7a5d1' 
  AND token = 'HRaJS2sH/THAeg07wnyUK5QdoLFB6qxZyjLg0V8s/aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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