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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '284edcaf55fc755582c1ac05f81f0989d5a9e88032cb5d23a3fde3a96468f75b' 
  AND token = '2g3rsP/BKq6SbUVr1tySkgdC10Vb+XeS1sa6TEB2tS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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