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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a34eef595196e0ea75534c1fdf14735d60bc92d018061da55d9054c2690ad3f0' 
  AND token = 'mhoP4ZYHl2CFkbGSjJGrq3QW0nWolFZFK+R4Fj94enM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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