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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c6d3bdb8924a5e83f7728d6b2fca3d107947cb751bccdba629862bb8028bb61' 
  AND token = 'rsK6x/40IGZpHtlNzsPSpqGYwoYiSnl93oAyTwtizII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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