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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3fbcb92c0937818f4e7acbcd68de2a2f963c8b105f5c0cc74fd4f49ec299c92' 
  AND token = 'QcrC+VuT++v0FUNqXENmmvmW4nsZSIEkeiep9BW2e9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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