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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31cc93192f981845cfd30cdd42add370684e3a8a9ce1ab691bdb20101d4d99d' 
  AND token = 'VqFq3BEkOySArJ1Ood6iATl3P/Dzz6P7GDQNhhnB/Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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